[sdiy] linearize OTA for VCF?

[jhaible at t-online.de]

> Well, of course. But Pease called it obsolete? If I call 
> something obsolete, 
> I usually try to suggest a replacement.

No, he asked me back if anybody else was still making the 13700.
For fairness' sake, I should say that it was a very quick reply.
Maybe I should try a second time.


> I Worked quite hard in 1979 to try to learn how to use 
> the LM13600. 

Are there any tricks you would like to share ?


> It was very frustrating for me, and the improvement in 
> performance was not that 
> great. (10dB improvement in the 0.5% distortion point.) I 
> wish I had put my 
> efforts into learning the CA3280.

Maybe the 3280 just has better transistors? (Lower noise,
lower offset?) How much SNR improovement is there in the
3280 (I mean 3280 with diodes vs. 3280 without diodes ?)
More than 10dB?

JH.